Although we aren't using an official Twitter-like application, I think that microblogging is not as good a tool for an enterprise as FriendFeed's real time widgets. I'm personally thinking of implementing a private room for our company and using it as our "Twitter-for-enterprise" app. The main drawback I see with Twitter is that there's no dialogue/comment threads, and I think it's pretty important to have this funcionality on an enterprise. - Jorge Escobar from FriendFeed MT Plugin